so i am finally going to TRY polyster strings. i was thinking hybrid MSV focus hex mains and NRG2 crosses. i heard low tension (around 45) poly is nice, if you are coming from multifilaments, so i thought of doing that. BUT, i wouldnt want NRG2 around there, i'd want it about 55. so i am thinking, would that warp my racquet bad? is 45lb poly only good on a full job? What tension should the poly mains be what should the multifilament crosses be if i am going to hybrid like that coming from 55lbs full multi?